Fountain pen



May 1.9, 1925".

E. SAKASAI FOUNTAIN PEN Filed July 20, 1922 3 Sheets-Shea?l 1 May 19, 192s. 1,538,006

E.' SAKASAI FOUNTAIN PEN Filed July 20. 1922 3 Sheets-Sheet 2 7a A15/M4' May "'19, 1925'.

E. SAKASAI FOUNTAIN PEN Filed July 20. 1922 5 Sheets-Sheet 5 Fig; W

VA r//////////////// Patented May 19, 1925.

rED STATES PATENT., OFFICE.

nisnnuno snimser, or Tonio, gnrnn.

FOUNTAIN nun.

Application led Jn1y120, 1922. Serial No. 576,340.

T all whom t may concern:

Beit. known that I, ErsAnUno ySA-KAsAi, a

subject of the Emperor of Japamresiding at No; lltchome, Matsui-cho, Honjo-lru, y'Iokyo, Japan, have invented certain new and rel and. secured atone end to the rear end of a pen section.

In the fountain-pens of this type, it is already known, that, in ,order to press or col.- lapse the rubber reservoir, a pressure bar is arranged parallel -therer-vith,...and a lever is projectingly provided at the central portion of the said bar, a slide being so pivoted to the said lever that it may be moved along the outside periphery of the barrel, with the effect that the lever -will be raised or lowered for causing the pressure vbar to move in the direction vertically of the moving direction of the slide.

7 the vertical movement of the lever -is hard to be eiiected on account vof incomplete con- *In the previous fountain-pens, however 'nection means for the slide and the lever,

and further, as the pivotal points of the said two elements come .to the dead points of crank motion of the lever, the operation of the slide is very ditlicult, and :besides these, there .are many disadvantages and detects such as, for example, the pressure bar may zbe easily flexed with. the result oi putting the pen out .of usequite soon.`

The object of this invention is to provide a fountain-pen without such defects, which comprises, for the connection .of the leverV andl the slide, a .pair of fixing members adapted to support the barrel and the slide by being secured yto the latter at the outer end and bent downat the other on to the inner wall of the former. The pivot pin for the said liXing members and the lever is made with different diameters, :the .middle portion ofwhich is larger than 4both `end portions, and the length of the `said middle portion of a large diameter is Vsomewhat longer than the width of the lever so that the same may beproperly operated in vertical direction without being pressed by the fixing members. The pressure bar is made of va thin metal strip with a comparatively large width, ,and is turned up or doubled at lnormal' or released position,

both sides. The curved parts of thek said bar are further straightened upwardly so as to form projecting edges, .whichserve yto -stfl'in the thin metal plate and prevent the same from flexing. The projecting .edges are made sloped or inclinedfso thattflielever may be operated easily without producing the dead poi-nt of crank motion when the lever is pressed down.

Thenonstriuctions, operations and advantages. oi the par-ts `olf ythe fountain-pen in accordance with ,this inventionwill be -i'ully described hereinafter, with reference .to the accompanying drawings, in which .Figure .l is a longitudinal sectional view of the oiuitain-pen, accord-ing to this invention, showing as when the rubber tube or. reservoir is .collapsed or pressed down,

Figure Qis a .similar view to Figure l, but,"

showingas when the said reservoir is heldin v Figure is fa cross sectional on line F3 3 ofFigure l, f

Figure .4 isalso a cross sec-tional view taken .on line off Figure 2,

vie-w I taken Figure 5` is a diagrammatical perspective I view .of the principal' parts oi' this. invention, 1. e., the slide, lever, pressune'bar, rpins anda pair off liXing mein-bers,`

Figure 6 1s a `fragmentary view` of the..

pressure bar, :sho-wing alsov the lever pivoted Figure 7 isan .enlarged view of fapart of Figure 3,.and v Y y Y `sFigure .8 ,is a reference' ,View .drawn forv better understanding of this invention.

vIn `the accompanying drawings, ll is a bar.- rel ,with yopen and closedends. The vopen endis freely engaged with .the penlsection 2 which .carries a pen ,3 at its ytop end andv has a. stepped portion dat the other. Vithin the barrel 1,ithere is provided a rubber tube or` reservoir i5, and, lone en d oit' which isV engaged with the stepped portion 4 of the penlsection and the vother is free and closed. rrIvihe said reservoir is normally kept expanded the elasticity .ot itself, as shown in'Figure 2, and is adapted to reserve the ink and further to supply'the pen with it through the `feeding groove i6 in thesa'ine lmanneras 1in the ordinary pens.` 7 is the pressure bar which is provided along .one side of the `rubber reservoir 5 vwithin the barrel l, and is ada ted for eliminating .the r,air .or ink from the-.said reservoir` .by l:means ,of collapsing the same,

as shown in Figure 1. As in Figure 5, the

,j said pressure bar is a vstrip .of metal yplate ref .portion of the lsaid projecting edges, and are provided with a pin hole 9. is a lever having pin holes 10 'and 10b at the upper and lwer ends respectively, and is pivoted, be` tweentl'ie protrusions 8, to the upper central parts of the pressure bar 7 by means ofthe pivot pin 11. passing through holes 9 and 10b. j 12 isa guide hole formed in the intermediate wall of the barrel 1. A13 is a slide made of thin metal plate which is -fixed to the outer side of the said guide hole so` as to be adapted forsliding along the outer periphery of the barrel 1, and has a pair of fixing lholes 13a formed in the center and as well as a varietyof suitable designs and the like worked on its surface.- 14l are a pair of fixing members of thin metal plate, each of which is adapted to. connect the slide 13 with y the top end of the lever 10, and is provided with a projection 14a at the top end and also a pinhole directly below the said'projection, as shown in Figure r5. The said fixing members 14 are securedto thev slide 13 by bending or curving the upper partsiof the projections liidown on to the surface of the slide `18, after passing the saidprojections through the fixing h'oles A'13 of the slide 13.

` The lowerA part 14C of each fixing member is curved outwardly so as to .fit closely with the inner surface of the wall of thev barrel 1', and vby the cooperation of this curved portion 141C and the bent, end of the projection 14;a the lslide 13 and the wall of the barrel are supported together so thatfthe former may rest upon the latter. Consequently the j diameterfor fitting with the pin hole 10. l

slide 13 may travel quite Asteadily and smoothly4 along the guide hole 12 without anyv involuntary slipping. 15 is av pivot pin, the` middle portion of which' is of a'suitable and the both ends is of a suitable diameter forlittingwith the hole 111b of the fixing memberslt. The said middle thick portion of the pivot lpin 15 has a slightly longer length than the .width of the lever 10, and the said pivot pin connects the slide 1di pivotally with the lever 10 by running through the pin holes 1()a and 14h. The reason for forming the pivot pin 15 into two portions ofdiifercntdiameterswill be described hereunder. If the diameter of thesaid pin were same throughout, as in Figure 8, the middle parts of the fixing members being apt tor swell in the direction indicated by an arrow 16 when the saine are bent at their upper projections 14 and lower parts 14, they would so strongly press the lever lying therebe tween that the latter' would receivemconvenience, of no smali measure in the swinging movement on account of the friction of the vsaid lever with the fixing members, and conldanger that the said slide wouldmove` without being operated by hand, causingk the ink' y in the reservoir to be pushed out. In brief, witlithe pivot pinl of the same diameter, as shown inFigure 8, the vsuitable moderate connection'betweenthe pin and the fixing members can be hardly obtained. Vhenthe pivot pin 15 is formed into twoparts of different diameters, as shown'in Figures 7 the lever 1() will never' be pressed strongly between the fixing members for the'reason that the latter being stopped at the stepped portion` of thepin 15, even though the upper and lower ends of the fixing members are ybentas strongly as ypossible ,to` the` slide and .the wail of the barrel; therefore, the fric tion between the above two members can be avoided, and the slide. may always befitted' closely with the barrel, thus eliminating the danger ofthe involuntary slipping of the slide. l

'The projecting edges 7b of. the pressure bar 7 are slightly sloped, that is, they are made thicker or higher gradually in the for.-

ward direction wherein the lever v10 lies.' The reason. for providing the projecting. .edges 7b with such slope or inclination is as follows (see Figure 6) The slidev 13 being arranged to be operated in the direction parallel with the base of the pressure bar 7, it will be clearly seen that the dead `point 'of crank motion of the lever 10 in'respect tothepivot pin 11 lies on the parallel line 'Td-7d with the base fc-,7c involving the said pinv 11; consequently, 'when the lever 10zis vrested down in parallel with the base 70-` 'the slide may not'be moved, for. the reason that, in this case, the pivot pin 15 of the leverl() is placed at the dead point of crank motion with reference to the pivot pin 11. While, in case the projecting edges 7b are given slope, the pin 15 of the lever 10 is always retained out of the parallel line Zd-J, so also is the dead point, and therefore the slide 13 may bemoved smoothly to cause the lever to move in a vertical direction. i

Briefly, the advantageous feature of the fountain-pen, accordingv to this invention, relates to the mechanism transmitting the movement of the slide 13 to .thepressure ,bar 7 that is, the lever l10, fixing members 14 and pivot pin 15', etc., and with this feature many disadvantages and defects herediss' i tary to the fountain-pens of this type are overcome, and the practical effect is obtained.

I claim 1. A fountain-pen comprising a pen sec-l tion, a rubber tube or reservoir provided within a barrel and secured at one end to the rear end ot' the said pen section, a pressure bar provided in parallel with the said reservoir, a lever projectingly arranged at 'he middle portion of the said lia-r' and a slide connected to the said lever, the said rubber reservoir being adapted to be collapsed by the said pressure bar in accordance with the sliding movement of the said slide; characterized by this that the lever being` connected with the slide by means of a pair of fixing members secured at the topv end to the slide and bent down on to the inner wall ot' the said barrel at the lower end so as to be adapted to support the slide and the barrel wall with the said two curved ends, in order to move the slidel steadily along the barrel without any involuntary slipping.

2. A fountain-pen according to claim 1, characterized b-y this that the lever and the fixing members are connected together by means oi a pivot pin which is formed with a large diameter in its middle portion and with a small diameter at both ends, the length oic the said middle portion ot a large diameter being made longer than the width of the lever so as to reduce the friction between the said fixing members and the lever.

3. A fountain-pen, according to claim 1, characterized by this that the pivot pin at the top end oiE the lever is arranged to remain permanently out of the dead point of crank motion in respect to the lower pivoty vis provided at one side with an inclined member.

5. In a fountain pen structure, a hollow barrel, a collapsible ink reservoir located in said barrel, a pressure member engaged with the reservoir having longitudinal ribs forming a channel therein, a member slidably mounted on the barrel and a link connection between the slidable member and said pressure member and received within the channel in the latter. l

6. In a fountain pen structure, a liollo barrel having a slot therein, a collapsible ink reservoir located within thebarrel, a pressure member engaged with said reservoir, a member slidably mounted on said barrel and a link connection between said slidable member and said pressure member,y

slot and pivotally connected with said link,

said fixing members having the inner extremities thereof engaged with the interior ot the barrel on opposite sides of the slotv for guiding the movement of the plate and i preventing displacement of 'the latter from the barrel.

In testimony whereof I atlix my signa-` ture.

Witness N. MAKAHASI. 

